First Alert Smoke Detector Alarm | Hardwired with Backup Battery, 6-Pack, BRK 9120B6CP $45.49

Since smoke detectors should be replaced every 10 years, and batteries cost money too, I was waiting for a good deal on the 6 pack (less than $8 per detector) to replace my house’s hardwired smoke detectors. I use a Leeo device for internet connectivity, and I have a separate CO alarm, so these will be exact replacements for what I have now. This is the almost lowest price according to the camels. Normal price as of late was around $55.
Amazon:
https://www.amazon.com/First-Aler…88901&th=1
Walmart:
https://www.walmart.com/ip/BRK-91…BEQAvD_BwE